On the day Nas‘ untitled Def Jam album hit No. 1 on The Billboard 200, the rapper joined political groups Color of Change and Move On, along with fans and protesters, outside of the Fox News building in New York to protest the network’s portrayal of African-Americans.

Color of Change and Move On delivered several boxes containing a petition signed by more than 620,000 people to support their cause, although Fox News refused to accept them.

Nas briefly spoke to the crowd of nearly 100 people and urged them to “stop the racist smears on the Obamas and black Americans.” In his speech, he cited examples of remarks made by Fox reporters that he and supporters found to be racist, including a reference to Michelle Obama as Barack Obama’s “baby mama,” and a fist bump between the couple as a “terrorist fist jab.”

Color of Change director Andre Banks said the campaign began about a month ago as an e-mail to the group’s members. After hearing Nas’ Fox-themed song “Sly Fox” a couple of weeks ago, he wanted to contact the rapper in hopes to get his support. “(We said), ‘Let’s call up his people and see if we can make it happen,'” Banks said.